After calibration, the image improved significantly, especially in terms of white balance, which is now more stable, and the hues have become more natural, eliminating the previous impression of an overly cool image. The calibration brought noticeable benefits in terms of tonality – the shadows and midtones are now more realistic, and the overall effect appears more harmonious. Unfortunately, hardware limitations still affect image quality. The brightness characteristics remain problematic, despite our efforts, and due to poor coverage of the DCI-P3 and BT.2020 colour spaces, delta E errors are still at a high level. Although the calibration improved some aspects, the television still does not allow for complete satisfaction.
Although the factory settings of the Filmmaker mode on the Hisense U6NQ were quite good, we decided to carry out a calibration to fully assess the capabilities of this model. Only after such an adjustment can one see how the television performs under ideal conditions. In the case of SDR content, which was already at a high level, we managed to further improve the white balance. However, the most significant change came from correcting the brightness characteristics – the gamma was optimised and no longer causes excessive dimming of the image, which improves its naturalness.
For 4K HDR content, the calibration also produced positive effects. We eliminated the blue dominance issue, resulting in a more balanced and natural image. However, managing brightness in HDR materials remains a more complex matter. The EOTF curve, while having problems with dimming the image in the 10–30% brightness range in laboratory conditions, reveals other shortcomings in real scenes. The television tends to excessively brighten the smallest elements on the screen. As a result, this leads to visible halo effects around bright objects. This phenomenon, which we mentioned earlier in the context of contrast and HDR, arises from the technological limitations of the particular model and is often difficult to eliminate.
In short: although the Filmmaker mode with factory settings performed decently, calibration allowed us to extract an even better effect – minor adjustments resulted in a more balanced image, especially in HDR content. For users seeking the highest quality picture, calibration will be a beneficial step.